Cooling your wort with ice

I realize this may not be the proper area for this discussion but I couldn't find a more appropriate area for it. I have, for the last several brews, used ice to cool my wort. And by that I don't mean an ice bath. I use approximately 12 pounds of ice to cool 3 gallons of wort (12 pounds is close to 2 gallons by weight) and then top off to make 5.5 gallons. I have yet to have a problem but everywhere I search I hear nothing but doom and gloom about contamination from "commercial" ice (from the local Quick-Mart/7-11 etc). I know a lot of guys think I've just been lucky and maybe I have but to be honest, this has worked really well for me. It cooled the wort down in a heartbeat from 200+ degrees to around 75-ish almost immediately and my beer has been great so far. So I just wanted to put this out there for others, using "commercial" grade ice has been no problem so far for me and has worked REALLY well. And a whole lot cheaper than a wort chiller, at least in the short term.

I tried this once but to skip the contamination part I get distilled water by the 2.5 gal jug and freeze it myself. A day before I brew I put it in the fridge and it usually has tiny little chunk left in the center (so the whole jug is around 0*C). If you don't have the time I've also brought it out of the freezer and put it on the counter to thaw. It usually has a much larger chunk of ice and I have to cut open the jug to get it all out.

I sanitize the jug before I freeze it with StarSan. My wort is chilled to 60*F in a couple minutes. It works great for me until I get a bigger kettle and a proper wort chiller.

I do the same thing only I am cheap I boil water add it to a sanitized 1 gallon orange juice jug that has been cleaned and soaked then sanitized add water and then freeze. when time come I sanitize jugs cut open and add to wort cools it very fast and haven't had any problems. I just visited the local Ice producer and they are actually do a really good job at sanitation. They use high quality filters reverse osmosis and then a UV light and the ice machine has a UV light. Heck I am willing to bet commercial ice is better than home made.

Oh and one more thing they use hot water to make ice so it is clear

Thanks for the responses. I've got some ice trays (large cubes) on order so I can freeze my own properly sterilized (boiled) water but until then I am just using commercial. It's good to know that the commercial ice makers are using fairly good sanitation procedures.